CVE-2026-26740 | Giflib 5.2.2 EGifGCBToExtension buffer overflow

VDB-351589 · CVE-2026-26740 · EUVD-2026-12914 GIFLIB 5.2.2 EGIFGCBTOEXTENSION BUFFER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.7 $0-$5k 0.33+ Summaryinfo A vulnerability was found in Giflib 5.2.2. It has been rated as critical. The impacted element is the function EGifGCBToExtension. This manipulation causes buffer overflow. The identification of this vulnerability is CVE-2026-26740. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. Detailsinfo A vulnerability has been found in Giflib 5.2.2 and classified as critical. Affected by this vulnerability is the function EGifGCBToExtension. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size. The advisory is shared at github.com. This vulnerability is known as CVE-2026-26740 since 02/16/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known. It is possible to download the exploit at github.com. It is declared as proof-of-concept. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12914). Productinfo Name Giflib Version 5.2.2 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 5.7 VulDB Base Score: 6.3 VulDB Temp Score: 5.7 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Buffer overflow CWE: CWE-120 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 02/16/2026 CVE reserved 03/18/2026 +30 days Advisory disclosed 03/18/2026 +0 days VulDB entry created 03/18/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Not defined CVE: CVE-2026-26740 (🔒) GCVE (CVE): GCVE-0-2026-26740 GCVE (VulDB): GCVE-100-351589 EUVD: 🔒 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/18/2026 19:58 Updated: 03/18/2026 20:58 Changes: 03/18/2026 19:58 (55), 03/18/2026 20:58 (1) Complete: 🔍 Cache ID: 99:C00:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸