"We have succeeded in securing the release of the wife. The husband will be set free in the next few days," said Anas al-Hamati, adding that the "kidnappers were from Al-Qaeda."
He did not say whether a ransom has been paid for the couple.
He did not give their identities, but South African media have named them as Yolande and Pierre Korkie.
Hamati told AFP by telephone that he was with the woman and approaching Sanaa.
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Al-Qaeda in the Arabian Peninsula, considered by Washington as the most dangerous branch of the jihadist network, remains active in parts of Abyan despite several military campaigns.
Security officials said in May the couple was seized outside their hotel by gunmen loyal to a local chief over a land dispute with the authorities.
The kidnappers came from the area of Janadiyah, some 35 kilometres (about 20 miles) east of Taiz, said one official.
But there have been cases of kidnappers handing over their captives to Al-Qaeda militants, possibly for money.
Although kidnappings of foreigners in Yemen are frequent, Taiz -- one of the country's biggest cities -- has not been the scene of hostage-taking.
Hundreds of people have been abducted in Yemen in the past 15 years, nearly all of whom have been freed unharmed.
Most kidnappings of foreigners are carried out by members of Yemen's powerful tribes who use them as bargaining chips in disputes with the central government.
The men were held for few days and were released following tribal mediation.