CVE-2026-96423: wireshark foundation wireshark Heap-based Buffer Overflow
CVSS: 7.1v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-96423DEBIAN-CVE-2026-96423
Published 29-09-2026Last modified 14-10-2026
Vulnerability summary
CVE-2026-96423 is a high (CVSS 7.1) Heap-based Buffer Overflow vulnerability in wireshark foundation wireshark. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.1/10
010
High · v3.1 (NVD)EPSS score
0.13%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 29-09-2026PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
X11 protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.1Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:HSources4 sources · 5.5–7.1
- CVE.orgCNA5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
29-09-202619-10-2026
EPSS score0.13%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (gitlab.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.
Affected systems
Debian1 product
- wiresharkAll versions (No fix recorded) | < 4.4.19-0+deb13u1 | < 4.6.9-1
Ubuntu1 product
- wiresharkAll versions (No fix recorded)
Wireshark1 product
- wireshark≥ 4.4.0, < 4.4.19 | ≥ 4.6.0, < 4.6.9
Wireshark foundation1 product
- wireshark≥ 4.6.0, < 4.6.9 | ≥ 4.4.0, < 4.4.19
4 vendors · 4 products
References
7 links- www.wireshark.org/security/wnpa-sec-2026-108.htmlVendor Advisory
