Vulnerability-Lookup

RHSA-2026:84587

Vulnerability from csaf_redhat - Published: 2026-10-19 02:45 - Updated: 2026-11-02 18:49

Summary

Red Hat Security Advisory: perl-URI security update

Severity

Moderate

Notes

Topic: An update for perl-URI is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: This module implements the URI class. Objects of this class represent "Uniform Resource Identifier references" as specified in RFC 2396 (and updated by RFC 2732). Security Fix(es): * URI: URI (for Perl): Security bypass due to incorrect hostname encoding via missing Unicode normalization (CVE-2026-19953) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-19953

A flaw was found in the URI component for Perl. This vulnerability occurs because the `nameprep` function, responsible for encoding hostnames, does not properly normalize Unicode characters. As a result, a hostname that is not in a standard Unicode form (non-NFC) can be encoded into a non-standard label. This discrepancy can lead to a situation where security checks, such as allow lists or Server-Side Request Forgery (SSRF) filters, may incorrectly process hostnames, potentially allowing an attacker to bypass security restrictions.

7.2 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE-838 - Inappropriate Encoding for Output Context

Affected products

Fixed 2 products

Product	Identifier	Version	Remediation
Unresolved product id: AppStream-10.2.Z:perl-URI-0:5.27-3.el10_2.1.noarch		—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:perl-URI-0:5.27-3.el10_2.1.src		—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:84587	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526492	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-19953	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526492	external
https://www.cve.org/CVERecord?id=CVE-2026-19953	external
https://nvd.nist.gov/vuln/detail/CVE-2026-19953	external
http://www.openwall.com/lists/oss-security/2026/0…	external
https://github.com/libwww-perl/URI/commit/956619a…	external
https://github.com/libwww-perl/URI/pull/191	external
https://metacpan.org/release/OALDERS/URI-5.36/changes	external
https://www.rfc-editor.org/rfc/rfc5891#section-5.2	external

JSON

To clipboard

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        "id": "CWE-838",
        "name": "Inappropriate Encoding for Output Context"
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          "title": "Vulnerability description"
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          "text": "URI: URI (for Perl): Security bypass due to incorrect hostname encoding via missing Unicode normalization",
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          "text": "This is a pure logic bypass (CWE-1289), not a memory safety vulnerability. Successful exploitation requires a very specific, multi-condition application pattern: (1) the application accepts a URL from untrusted network input; (2) it parses the URL with `URI-\u003enew()`; (3) it extracts the hostname via `-\u003ehost()` and uses it for a security decision (e.g., SSRF filtering); and (4) it separately fetches the URL with a client that performs correct IDNA normalization. Only when all four conditions are simultaneously true can an attacker bypass the security control.",
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            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
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}

CVE-2026-19953 (GCVE-0-2026-19953)

Vulnerability from cvelistv5 – Published: 2026-08-31 17:29 – Updated: 2026-09-01 15:16

Title

URI versions before 5.36 for Perl encode non-NFC host names to non-standard punycode labels via missing normalization in nameprep

Summary

URI versions before 5.36 for Perl encode non-NFC host names to non-standard punycode labels via missing normalization in nameprep. nameprep lowercases each host label but performs no Unicode normalization. IDNA requires a label to be normalized to Form C before it is encoded (RFC 5891), so a label that is not already in NFC is encoded to a different A-label than its normalized form. A label built from the precomposed Devanagari sequence U+0958 U+093E encodes to xn--72b5c without normalization but to xn--11b2fg after NFC normalization, and xn--72b5c does not round-trip back to the original label. Any caller that reads host() from a URI built from untrusted input and uses it for a security decision (an allow or deny list, an SSRF filter, deduplication, a cache key) sees the non-standard label, while a client that fetches the same URL resolves the NFC form, so the check and the fetch can disagree about the host.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:16 UTC

CWE

CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 366 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/libwww-perl/URI/commit/956619a…	patch
https://github.com/libwww-perl/URI/pull/191	issue-tracking
https://metacpan.org/release/OALDERS/URI-5.36/changes	release-notes
https://www.rfc-editor.org/rfc/rfc5891#section-5.2	technical-description
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 5.36 (custom)

Credits

Naseeb Dangi (naseeb0), Nankai University

Show details on NVD website

JSON

To clipboard

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      ],
      "source": {
        "discovery": "UNKNOWN"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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