CVE-2026-20911: libraw Incorrect Calculation of Buffer Size
Vulnerability summary
CVE-2026-20911 is a critical (CVSS 9.8) Incorrect Calculation of Buffer Size vulnerability in libraw. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.4% of scored vulnerabilities. 2 public exploits are recorded.
Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 07-04-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
Description
A heap-based buffer overflow vulnerability exists in the HuffTable::initval functionality of LibRaw Commit 0b56545 and Commit d20315b. A specially crafted malicious file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.63%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
0.00 pp
From 0.63% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (talosintelligence.com)
Maturity: unknown
Exploit Reference (talosintelligence.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-131Incorrect Calculation of Buffer SizeThe product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
- CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')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.
Affected systems
Ubuntu7 products
- darktableAll versions (No fix recorded)
- dcrawAll versions (No fix recorded)
- digikamAll versions (No fix recorded)
- exactimageAll versions (No fix recorded)
- kodiAll versions (No fix recorded)
Debian1 product
- libraw< 0.22.1-1
Libraw1 product
- librawCommit 0b56545 | Commit d20315b | 0.22.0 | 0.22.1
3 vendors · 9 products
