SUSE-SU-2026:1500-1
Vulnerability from csaf_suse - Published: 2026-04-20 16:16 - Updated: 2026-04-20 16:16Summary
Security update for libpng15
Severity
Important
Notes
Title of the patch: Security update for libpng15
Description of the patch: This update for libpng15 fixes the following issues:
- CVE-2026-34757: use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` can lead to information
disclosure and data corruption (bsc#1261957).
- CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` can lead to arbitrary code
execution (bsc#1260754).
Patchnames: SUSE-2026-1500,SUSE-SLE-SERVER-12-SP5-LTSS-2026-1500,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-1500
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
8.1 (High)
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
5.1 (Medium)
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
References
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}
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"notes": [
{
"category": "general",
"text": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng 1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS` sets `png_ptr-\u003etrans_alpha = info_ptr-\u003etrans_alpha` (256-byte buffer) and `png_set_PLTE` sets `info_ptr-\u003epalette = png_ptr-\u003epalette` (768-byte buffer). In both cases, calling `png_free_data` (with `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr` pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes the issue.",
"title": "CVE description"
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"date": "2026-04-20T16:16:39Z",
"details": "important"
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"title": "CVE-2026-33416"
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"text": "LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.",
"title": "CVE description"
}
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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