CVE Explorer
CVE-2026-56288
GNU patch is vulnerable to a NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing.
An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service.
This issue has been fixed
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"patch","repo":"https://cgit.git.savannah.gnu.org/cgit/patch.git/","vendor":"GNU","versions":[{"lessThanOrEqual":"2.8.0","status":"affected","version":"0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":4.6,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"tags":["third-party-advisory"],"url":"https://cert.pl/en/posts/2026/07/CVE-2026-56288"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/references/0
{"tags":["product"],"url":"https://cgit.git.savannah.gnu.org/cgit/patch.git/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/references/1
{"tags":["patch"],"url":"https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=e6d6a4e021660679d7fc9150f981d4920f722313"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:809e08112e8a007f3dea9b81b660e3a8823f18a1fda1a2ae921ff3b850fdc4c2 · sha256:5238b29ac9c1dda9… · /containers/cna/references/2
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.