Bug 2456735 (CVE-2026-39892)

Summary: CVE-2026-39892 cryptography: Cryptography: Buffer overflow via non-contiguous buffer in API
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: alinfoot, anpicker, anthomas, aprice, bbrownin, bdettelb, bparees, brasmith, caswilli, cmyers, cochase, derez, dfreiber, dnakabaa, doconnor, dranck, drow, dschmidt, dtrifiro, eborisov, ebourniv, ehelms, erezende, ggainey, hasun, jburrell, jdobes, jfula, jkoehler, jlanda, jmitchel, jowilson, jsamir, juwatts, jwong, kaycoth, kgaikwad, kshier, lball, lcouzens, lgallett, ljawale, lphiri, luizcosta, mbarnett, mhayden, mhulan, ngough, nmoumoul, nweather, nyancey, oezr, omaciel, ometelka, orabin, osousa, pakotvan, pbohmill, pcreech, ptisnovs, rbobbitt, rbryant, rchan, rhel-process-autobot, rjohnson, sbunciak, sdoran, simaishi, smallamp, smcdonal, stcannon, sthirugn, syedriko, teagle, tmalecek, ttakamiy, veshanka, vkumar, watson-tool-maintainers, weaton, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the cryptography library. This vulnerability occurs when a non-contiguous buffer is passed to certain application programming interfaces (APIs) that accept Python buffers, such as Hash.update(). A remote attacker could exploit this to cause a buffer overflow, potentially leading to a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2457080, 2457081, 2457082    
Bug Blocks:    

Description OSIDB Bzimport 2026-04-08 22:01:23 UTC 
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.