GNU Emacs up to 31.0.90 Image Loader integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in GNU Emacs up to 31.0.90. This affects an unknown part of the component Image Loader. Performing a manipulation results in integer overflow. This vulnerability is cataloged as CVE-2026-77219. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in GNU Emacs up to 31.0.90. This affects an unknown code of the component Image Loader. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

GNU Emacs before 31.0.91 contains an integer overflow in the PBM/PPM/PGM image loader that allows an attacker to leak heap memory contents by supplying a crafted image with large dimensions and an elevated max color index. The image loader multiplies image dimensions and channel count using signed integer arithmetic; for sufficiently large values, the result wraps to a negative number, bypassing the bounds check and causing the pixel reader to access heap memory past the end of the allocated buffer. The over-read contents are interpreted as pixel color values and rendered on screen.

The advisory is shared at debbugs.gnu.org. This vulnerability is uniquely identified as CVE-2026-77219 since 08/20/2026. The exploitability is told to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 31.0.91 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Word Processing Software

Vendor

• GNU

Name

• Emacs

Version

• 31.0.0
• 31.0.1
• 31.0.2
• 31.0.3
• 31.0.4
• 31.0.5
• 31.0.6
• 31.0.7
• 31.0.8
• 31.0.9
• 31.0.10
• 31.0.11
• 31.0.12
• 31.0.13
• 31.0.14
• 31.0.15
• 31.0.16
• 31.0.17
• 31.0.18
• 31.0.19
• 31.0.20
• 31.0.21
• 31.0.22
• 31.0.23
• 31.0.24
• 31.0.25
• 31.0.26
• 31.0.27
• 31.0.28
• 31.0.29
• 31.0.30
• 31.0.31
• 31.0.32
• 31.0.33
• 31.0.34
• 31.0.35
• 31.0.36
• 31.0.37
• 31.0.38
• 31.0.39
• 31.0.40
• 31.0.41
• 31.0.42
• 31.0.43
• 31.0.44
• 31.0.45
• 31.0.46
• 31.0.47
• 31.0.48
• 31.0.49
• 31.0.50
• 31.0.51
• 31.0.52
• 31.0.53
• 31.0.54
• 31.0.55
• 31.0.56
• 31.0.57
• 31.0.58
• 31.0.59
• 31.0.60
• 31.0.61
• 31.0.62
• 31.0.63
• 31.0.64
• 31.0.65
• 31.0.66
• 31.0.67
• 31.0.68
• 31.0.69
• 31.0.70
• 31.0.71
• 31.0.72
• 31.0.73
• 31.0.74
• 31.0.75
• 31.0.76
• 31.0.77
• 31.0.78
• 31.0.79
• 31.0.80
• 31.0.81
• 31.0.82
• 31.0.83
• 31.0.84
• 31.0.85
• 31.0.86
• 31.0.87
• 31.0.88
• 31.0.89
• 31.0.90

License

• open-source

Website

• Vendor: https://www.gnu.org/

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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