Bug 2542687 (CVE-2026-102271)
| Summary: | CVE-2026-102271 pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | akhatavk, alinfoot, amctagga, anpicker, anthomas, aoconnor, aos-team-art-private, aprice, asdas, bbrownin, blitton, bniver, bparees, cahl, cmyers, dfreiber, dkeler, dnakabaa, doconnor, dpaolell, dranck, drow, dschmidt, dtrifiro, eborisov, ebourniv, eglynn, ehelms, flucifre, ggainey, gmeno, groman, hasun, ikhan, ilpinto, jburrell, jdelft, jfula, jjoyce, jlanda, jmitchel, jowilson, jpasqual, jpretori, jsamir, jschluet, jupierce, juwatts, jwong, kaycoth, kshier, lball, lbrazdil, lcouzens, lgarciaa, lhh, ljawale, ltomasbo, mbarnett, mbenjamin, mbiarnes, mburns, mdellweg, mgarciac, mhackett, mhayden, mhulan, mminar, msilmser, ngough, nmoumoul, nyancey, oezr, omaciel, ometelka, osousa, pcreech, ppalepu, ppostler, prdhamdh, ptisnovs, rbiba, rbobbitt, rchan, rekumar, rhel-process-autobot, rjohnson, sbunciak, sdoran, sghai, sidsharm, simaishi, smallamp, sostapov, sskracic, stcannon, suppawar, syedriko, thason, tmalecek, tpfromme, ttakamiy, vereddy, veshanka, vkumar, vlaad, vvoronko, watson-tool-maintainers, weaton, xdharmai, yguenane, ykashtan |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in PyJWT. The library fails to identify asymmetric public keys supplied in Distinguished Encoding Rules (DER) format, inadvertently treating the public data as a shared secret in Hash-based Message Authentication Code (HMAC) operations. If an application supports both asymmetric and symmetric signing algorithms, a remote attacker knowing the public key can exploit this flaw to forge valid authentication tokens and bypass access controls.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-09-28 20:46:14 UTC
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